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| All Patents in class 91/300 | |||||
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| Number | Date | Patentee | Title | Type | |
| 626,497 | Jun. 06, 1899 | E.C. Meissner | Pneumatic Hammer | handheld power hammers | |
| 735,589 | Aug. 04, 1903 | C.B. Richards | Impact Tool | pneumatic tools | |
| 794,738 | Jul. 18, 1905 | C.K. Pickles | Fluid-Pressure Impact Tool | pneumatic tools | |
| 962,717 | Jun. 28, 1910 | V.J. O'Brien | Valve for Hammer Drills | pneumatic tools | |
| 3,232,176 | Feb. 01, 1966 | L.A. Wagnon, R.E. Shulters, L. Kramer, J.C. Hearning | Percussion tool | ||